Update mockery/mockery requirement from ^1.5 to ^1.6

Updates the requirements on [mockery/mockery](https://github.com/mockery/mockery) to permit the latest version.
- [Release notes](https://github.com/mockery/mockery/releases)
- [Changelog](https://github.com/mockery/mockery/blob/1.6.1/CHANGELOG.md)
- [Commits](mockery/mockery@1.5.0...1.6.1)

---
updated-dependencies:
- dependency-name: mockery/mockery
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -27,7 +27,7 @@
     "require-dev": {
         "doctrine/dbal": "^2.8|^3.0",
         "laravel/legacy-factories": "^1.3",
-        "mockery/mockery": "^1.5",
+        "mockery/mockery": "^1.6",
         "orchestra/database": "^6.28|^7.0",
         "orchestra/testbench": "^6.28|^7.0",
         "orchestra/testbench-core": "^6.28|^7.0",